books.google.com - A tribe is any group of people, large or small, who are connected to one another, a leader, and an idea. For millions of years, humans have been seeking out tribes, be they religious, ethnic, economic, political, or even musical (think of the Deadheads). It&#39;s our nature.Now the Internet has eliminated...http://books.google.com/books/about/Tribes.html?id=sa9pSQbXYtYC&q=million&utm_source=gb-gplus-shareTribes